| Geyser | 1979-04-21 |
|---|---|
| Giantess | 1629 |
| Values for Old Faithful Area | 1979-04-21 |
|---|---|
| Astronomical Twilight Begin | 03:40 |
| Nautical Twilight Begin | 04:21 |
| Civil Twilight Begin | 04:58 |
| Sunrise | 05:29 |
| Sunset | 19:14 |
| Civil Twilight End | 19:45 |
| Nautical Twilight End | 20:23 |
| Astronomical Twilight End | 21:03 |
| Moon Illumination | 32.98% |